First advise all to discuss an have a plan for evacuating rv if you smell electrical or other burning smell.Seconds count as we witnessed on ours couple weeks agp!
As for smell you experience do your best to find it.We have purchased another rv same age as yours an i will pull all fuses on this one individually an check for corosion an will look other potential places for rubbing or corossion at connections.I have a suspession our fire started in a 12volt fuse box.Ours did have the distinc smell of electrical wire.